Application Research on Vibration Isolation Performance of Rail Transit Fastener
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摘要: 根据隔振原理,在双层非线性扣件基础上进行结构和动力学参数优化,选取工况基本一致的线路,分别进行轨道系统的动态变形、振动和传递特性测试。测试结果表明,优化后的双层非线性减振扣件满足轨道线路安全要求,与优化前减振扣件相比,优化后减振扣件垂向一阶频率降低,阻尼增大,隧道壁1~80 Hz频段Z计权加速度总振级降低1.7~2.2 dB,表明优化后的减振扣件具有较好的隔振效果。Abstract: According to the principle of vibration isolation, the structural and dynamic parameters were optimized on the basis of double-layer nonlinear fasteners, and the dynamic deformation, vibration and transmission characteristics of track system were tested respectively by selecting the lines with similar working conditions. The test results showed that the optimized double-layer nonlinear damping fastener could meet the safety requirements of track line. Compared with the original damping fastener, the vertical first-order frequency with the optimized fastener was reduced, the damping increased, and the Z-weighted acceleration total vibration level of the tunnel wall vibration was reduced by 1.7~2.2 dB, which proved that the optimized damping fastener had better vibration isolation effect.
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